package com.anlu.pattern.action.observer;

import java.util.ArrayList;
import java.util.List;

/**
 *
 */
public abstract class Attentions {
    // 关注客户列表
    protected List<Observer> observers = new ArrayList<>();
    //关注顾客
    public void add(Observer observer){
        observers.add(observer);
    }
    //取消关注
    public void remove(Observer observer){
        observers.remove(observer);
    }

    //发通知
    public abstract void notifyObservers();



}
